<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - -fprofile-generate profile merging from concurrent processes fails on Windows with "LLVM Profile Error: Failed to write file ... File exists""
href="https://bugs.llvm.org/show_bug.cgi?id=43425">43425</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>-fprofile-generate profile merging from concurrent processes fails on Windows with "LLVM Profile Error: Failed to write file ... File exists"
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hans@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>For example, consider a simple program:
int main() {
unsigned x = 1;
for (int i = 0; i < 100*1000*1000; i++) {
x *= i;
}
return 0;
}
built with instrumentation:
clang-cl -fprofile-generate=\src\tmp\ \src\tmp\a.cc
and run in an bunch of concurrent invocations (using e.g. Cygwin):
$ for i in `seq 1 100` ; do ./a.exe & done
A bunch of the program invocations fail to write their profile:
LLVM Profile Error: Failed to write file
"\src\tmp\default_15822669652030248442_0.profraw": File exists
LLVM Profile Error: Failed to write file
"\src\tmp\default_15822669652030248442_0.profraw": File exists
LLVM Profile Error: Failed to write file
"\src\tmp\default_15822669652030248442_0.profraw": File exists
(This shows up when running instrumented tablegen binaries as part of building
IR-instrumented Clang on Windows, see e.g.
<a href="https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8901886476057032176/+/steps/package_clang/0/stdout">https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8901886476057032176/+/steps/package_clang/0/stdout</a>)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>